@book { BlackGoldBlackSwansTheimportanceoftheunexpectedforthefutureofenergy,
    title = "Black Gold, Black Swans: The importance of the unexpected for the future of energy",
    author = "Ullrich {Müller}",
    year = "2013",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    doi = "10.3239/9783954895854",
    url = "https://m.anchor-publishing.com/document/231981"
}